Retirement benefit obligations - Schedule of Change in Fair Value of Scheme Assets (Details) - Post-employment retirement benefits - GBP (£) £ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Changes in the fair value of scheme assets
At 1 January	£ 32,697	£ 51,534
Return on plan assets excluding amounts included in interest income	(318)	(20,302)
Interest income	1,602	997
Employer contributions	1,342	2,530
Benefits paid	(1,544)	(2,048)
Settlements	0	(13)
Administrative costs paid	(35)	(34)
Exchange and other adjustments	(11)	33
At 31 December	£ 33,733	£ 32,697

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Benefits paid

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